[Feature Request]: Add support for IBM Watsonx.ai LLM provider

[kevalmahajan]

🧭 Type of Feature

Please select the most appropriate category:

• Enhancement to existing functionality
• New feature or capability
• New MCP-compliant server
• New component or integration
• Developer tooling or test improvement
• Packaging, automation and deployment (ex: pypi, docker, quay.io, kubernetes, terraform)
• Other (please describe below)

🧭 Epic

Title: Add IBM Watsonx.ai LLM provider for LLM Chat
Goal: Integrate IBM Watsonx.ai as a supported LLM provider to enhance AI-driven chat capabilities for enterprise users.
Why now: So users can choose their own LLM provider out of all available.

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🙋♂️ User Story 1

As a: business enterprise using IBM Watsonx.ai,
I want: integrate Watsonx.ai as an LLM provider for agentic llm chat in context forge,
So that: I can leverage its advanced AI capabilities, ensuring secure, context-aware, and industry-specific conversational intelligence for my customer support and internal operations.

🔗 MCP Standards Check

• Change adheres to current MCP specifications
• No breaking changes to existing MCP-compliant integrations
• If deviations exist, please describe them below:

[kevalmahajan]

Closed by #1350